Basin Wiki is back online again, and Lightning Enchanted bolts and Scarab Demon bolts
are different:
buglightning inflicts (mlvl+1)/2 lightning damage, so a level 75 Dung Soldier in the Rocky Waste in Hell should only inflict 38 lightning damage per bolt (which shouldn't increase with player count, but can be doubled by a critical hit).
Upon watching the video and learning that Kitteh had Lightning Resist 75% (which should have reduced each bolt from 38 to 9.5), the first thing that sprang to mind was
Fire Enchanted explosion(s): due to a bug, an FE Scarab Demon
and its minions 'explode' whenever they're put into hit recovery, which makes them
incredibly dangerous for a War Cry Barbarian. The targeted Dung Soldier obviously wasn't an FE Unique or minion, but if one or more of the others was...